It's depend on you how much you need for trade, trade is free you can use of small amount to started.
and not recommended to using a lot of money if do not have a skill to do that.
Actually a Exchange site has a minimum amount of trades, but for the amount of capital you need to trade, you have to see it in terms
of your skills and financial ability, if you're still not skilled yet, it would be better if you used a little capital first until you become an expert